OBD Guide
ENFRDEESPT

P05B1

Active Grille Air Shutter B Control Circuit/Open

P05B1 is an OBD-II diagnostic trouble code meaning: Active Grille Air Shutter B Control Circuit/Open. Common causes: broken wire in the actuator control circuit harness, oxidized connector with broken contact.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately

Symptoms

  • Check Engine light on
  • Blinds do not respond to control commands
  • Blinds are fixed in one position
  • Possible overheating or poor performance
  • Lack of load current in the control circuit during diagnostics

Causes

  • Broken wire in the actuator control circuit harness
  • Oxidized connector with broken contact
  • Damage to the connector (broken terminal, dropped contact)
  • Internal break in the winding of the blinds actuator
  • ECU output driver malfunction

How to Fix

  1. Read codes and record the conditions under which the error occurred
  2. Inspect the control circuit wiring from the ECU to the actuator for damage.
  3. Measure the resistance of the actuator winding (disconnect the connector, measure between the terminals)
  4. Check connectors for oxidation, broken terminals, or fallen contacts.
  5. Check the output signal of the computer when the ignition is on (voltage on the control wire)
  6. Repair the wiring or replace the actuator based on diagnostic results

Related codes

P05B2P05B3P05B4P05AEP05AF

Error P05B1 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05B1 code mean?

P05B1 is an OBD-II diagnostic trouble code that indicates: Active Grille Air Shutter B Control Circuit/Open

What causes a P05B1 error code?

The most common causes of P05B1 include: Broken wire in the actuator control circuit harness; Oxidized connector with broken contact; Damage to the connector (broken terminal, dropped contact); Internal break in the winding of the blinds actuator.

How do I fix a P05B1 diagnostic trouble code?

To fix P05B1: Read codes and record the conditions under which the error occurred. Inspect the control circuit wiring from the ECU to the actuator for damage.. Measure the resistance of the actuator winding (disconnect the connector, measure between the terminals). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05B1?

Do not drive — repair immediately

FRDEESPT

See also: Russian version · NationStat